I can never remember them and would need a written key to help! For years I had Save As on a post it note to remind me how do save and keep things, it would drive MrN nuts.
Try learning one at a time, and use it as much as you can:
The most recent I've found is Ctrl+shift+n to make a new folder.
Another good one is F2 to rename a file or folder (select it, them press F2, type in what you want and press Enter. If you use the arrow keys to move through the folders you can go ages without using the mouse at all.
Tab is a good one as well, for moving through fields on a form.
And then alt Gr + a vowel, for doing accents - á é í ó ú (which accent is that, Arena?)
I have a chart of alt codes, such as alt+0196 for Ä
My favourite of those though is alt+0229 or alt+134 for å, and I'll tell you for why:
^^^ I can see why you remember that one 😄 All these tips are only good upstairs where there is a proper keyboard. Tablets are pretty hopeless for nearly everything, aside from the fact you can use one with your feet tucked under yourself in an armchair...